jquery - 对所有 Web 浏览器使用 keydown

Question

有人可以帮我吗，我如何将keyCode，which，charcode定义为变量。下面是我的代码。但似乎在 Firefox 中不起作用。我已经尝试过 Google Chrome，并且它工作正常。

    $(function() {
      $('#txtInput').keydown(function(event) {

      var Key = event.keyCode ? event.keyCode : event.which ? event.which : event.charCode;
            //number
        if (Key >= 48 && Key <= 57)
            return true;
        //numpad
        else if (Key >= 96 && Key <= 105)
            return true;
        //backspace,tab
        else if (Key >= 8 && Key <= 9)
            return true;
        else return false;
    });
});

Answer 1

我认为 event.which 足以检查 keyCode 并且适用于所有浏览器。

根据 jQuery 文档:

The event.which property normalizes event.keyCode and event.charCode. It is recommended to watch event.which for keyboard key input.

更多

event.which also normalizes button presses (mousedown and mouseupevents), reporting 1 for left button, 2 for middle, and 3 for right. Use event.which instead of event.button.

代码

$('#txtInput').keydown(function(event) {

    var Key = event.which;
    //number
    if (Key >= 48 && Key <= 57) {
        alert('number');
        return true;
    }
    //numpad
    else if (Key >= 96 && Key <= 105) {
        alert('numpad');
        return true;
    }
    //backspace,tab
    else if (Key >= 8 && Key <= 9) {
        alert('backspace, tab');
        return true;
    }
    else return false;
});

<强> Working sample

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